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Related Experiment Videos

Explosibility boundaries for fly ash/pulverized fuel mixtures.

A G Dastidar1, P R Amyotte

  • 1Department of Chemical Engineering, Dalhousie University, P.O. Box 1000, NS, B3J 2X4, Halifax, Canada.

Journal of Hazardous Materials
|May 7, 2002
PubMed
Summary

Fly ash contaminated with pulverized coal dust poses an explosion risk. Larger fly ash particles increase this hazard, requiring less coal dust to create an explosive mixture.

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Area of Science:

  • Industrial Safety
  • Combustion Science
  • Materials Science

Background:

  • Incomplete combustion in waste streams can lead to fuel contamination, creating explosion hazards.
  • Fly ash contaminated with unburned pulverized coal presents a significant risk due to coal's fuel properties.

Purpose of the Study:

  • To determine the minimum fuel contamination level of fly ash required to form an explosible mixture.
  • To investigate the impact of fly ash particle size on the explosibility of coal-contaminated mixtures.

Main Methods:

  • Experiments were conducted using a 20-liter Siwek explosibility test chamber.
  • Fly ash from Ontario Power Generation was artificially contaminated with pulverized coal dust.
  • Fine and coarse fractions of fly ash were separated and tested.

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Main Results:

  • A minimum of 21% pulverized coal (10% volatile matter) was needed for the original fly ash to form an explosive mixture.
  • Fine fly ash required 25% coal dust (12% volatile matter), while coarse fly ash required only 10% coal dust (7% volatile matter).

Conclusions:

  • Fly ash particle size significantly influences the minimum coal dust concentration required for explosibility.
  • Larger inert fly ash particles increase the explosion hazard by lowering the required fuel contaminant percentage.